How to use WHERE with DATEPART in MSSQL

Hi There,

I'd like to pull out records where the day of the week is Friday or Saturday. So I have the following query:

SELECT aId, aStatus
FROM Availability
WHERE DATEPART(weekday,aDate) = 5 OR DATEPART(weekday,aDate) = 6

Open in new window


I get an error message thus:

Microsoft OLE DB Provider for SQL Server error '80040e14'

An expression of non-boolean type specified in a context where a condition is expected

Is it possible to use Datepart in this way, and if so, how can I fix this query? If not, what is the best way to achieve the same result?

Thank you,

Dan
stressfreewebsAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

AnujSQL Server DBACommented:
SELECT aId, aStatus
FROM Availability
WHERE DATEPART(weekday,aDate) IN (5,6)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
lluddenCommented:
The query works fine for me.  You can try putting parenthesis around the conditions, or using IN as suggested above.

Keep in mind that doing a query like that, with calculations on a database field, will always result in a table scan, so performance may be pretty poor if the table is large.  Use a calendar table or an indexed computed field if you need to improve performance.
0
stressfreewebsAuthor Commented:
Thanks...no idea why what I had wasn't working, but as soon as I swapped to this tidier version, it worked a treat!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.